how to add multisite on wamp server.

I am having warning message as,”An existing WordPress network was detected.”

how to solve this,I read some of threads in forum,But not able to get clear idea.
My database contain,
wp_blogs, wp_blog_versions , wp_commentmeta , wp_comments , wp_links , wp_ngg_album , wp_ngg_gallery , wp_ngg_pictures , wp_options , wp_postmeta , wp_posts , wp_registration_log , wp_signups , wp_site , wp_sitemeta , wp_terms , wp_term_relationships , wp_term_taxonomy , wp_usermeta
wp_users.
Please help me to solve this problem.

I believe you have activated the Network.

In order to visit the Network Admin, please go to the:

https://example.com/wp-admin/network

Otherwise, the WP Admin Bar has a dropdown which has My Sites > Dashboard, which basically takes you to the Network Admin as well.

Let me know how that goes. Cheers!

when I click login page,it shows error 500,Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator, admin@localhost and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.

Why it is happened?

I can’t troubleshoot without seeing it in front of me.

I found this user has the same initial issue which might be related. Please have a read.

Otherwise, I suggest that you start with a fresh install of WordPress and use a different database table.

What is the full content of your .htaccess?

My .htaccess file contains,

RewriteEngine On
RewriteBase /wordpress/
RewriteRule ^index\.php$ - [L]

# uploaded files
RewriteRule ^([_0-9a-zA-Z-]+/)?files/(.+) wp-includes/ms-files.php?file=$2 [L]

# add a trailing slash to /wp-admin
RewriteRule ^([_0-9a-zA-Z-]+/)?wp-admin$ $1wp-admin/ [R=301,L]

RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]
RewriteRule  ^[_0-9a-zA-Z-]+/(wp-(content|admin|includes).*) $1 [L]
RewriteRule  ^[_0-9a-zA-Z-]+/(.*\.php)$ $1 [L]
RewriteRule . index.php [L]

I just copy codex code into my .htaccess file.

Is there any sepreate username and password for superadmin

First no. There is no separate username/password for Super Admin. Your ID (provided you are ID 1) is the admin.

I am having warning message as,”An existing WordPress network was detected.”

That usually means you didn’t put the rest of the wp-config.php files so double check that.

when I click login page,it shows error 500,Internal Server Error

That usually is a .htaccess error, which is why I asked ?? Is that your WHOLE .htaccess?

yes,That’s my whole .htaccess file with BEGIN and END WORDPRESS statement..

Is WAMP set up to use .htaccess?

Sorry for delay.
Yes I set up wamp on my system.

Not the same thing. Did you set up WAMP to use .htaccess? Windows doesn’t always pay attention.

https://stackoverflow.com/questions/4391530/how-to-use-htaccess-in-wamp-server

hi,
I tried the instructions in that question,that I goto httpd file and delete # symbol in rewrite module,And I restart all service,I also checked that rewrite module is on in apache.
But again I got the same error,like internal server error.

I think my httpd file may not the options,
My Dircetory part in that file is,

<Directory />
    Options FollowSymLinks
    AllowOverride None
    Order deny,allow
    Deny from all
</Directory>

and these two lines are also missing in mty file.
Sorry,I am new to wordpress.So can’t understand problem,where it exactly happens.

Thanks in advance.

In my apache_error log file show as,

[Mon Nov 19 16:51:31 2012] [alert] [client 127.0.0.1] C:/wamp/www/word Press1/wordpress/.htaccess: Invalid command 'RewriteEngine', perhaps misspelled or defined by a module not included in the server configuration.

I checked some links also https://stackoverflow.com/questions/10144634/htaccess-invalid-command-rewriteengine-perhaps-misspelled-or-defined-by-a-m
In that I found one lines is missing in my file,that clear module.

Not able to get clear idea,
Please help me as soon as possible

I’m moving this to the localhost section, since I think it’s to do with that more than Multisite